Induced absorption filter (IAF)

Details Induced absorption filter (IAF) Induced absorption filter (IAF)

2005-02-22

2005-02-22

Wong, Don (Department: 2828)

Coherent light generators

Particular resonant cavity

C372S099000

Reexamination Certificate

active

06859483

ABSTRACT:
An optical filter uses a multi-layer, stack of alternating dielectric layers (16, 18) of different refractive indices, a dielectric spacer layer (20) and metal layer (21), to achieve a narrow overall absorption bandwidth, with high reflectance upon either side. A tunable (optical) filter variant uses a dielectric stack and spacer coating of spatially-varying thickness, that is a coating of depth varying, say linearly and/or circularly, according to position across an absorbent layer or substrate, whereby, at different positions on the surface, a different wavelength is absorbed. A tunable laser (35) uses opposed tunable filters (26, 28) bounding a lasing medium (38), such as CO2gas, for selective variable stimulated emission of radiation (39).

REFERENCES:
patent: 5341238 (1994-08-01), Trost et al.
patent: 5784507 (1998-07-01), Holm-Kennedy et al.
patent: 5814416 (1998-09-01), Dodabalapur et al.
patent: 5874803 (1999-02-01), Garbuzov et al.
patent: 6154480 (2000-11-01), Magnusson et al.
patent: 6185241 (2001-02-01), Sun

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